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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5d5e38e29fd83b91d4de255369f53cf2192f49c5a1b895d69d0736ed3668591e' 
  AND token = 'JRdSKnsEjez7TutskqfAWEUpRsxCrbysIGQHFEOhBck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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