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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '491caa08bad9c00053f67aaa383a48c0af197f45a54e9683c773927cc3175390' 
  AND token = 'a6uu95alvTTsAW60tQbXwJc81eDPInZzzmGapGySrkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}