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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bfcbb4f45707aa5f0841b414781d7e2676ed547149e57a311e5df929b3d6ec17' 
  AND token = 't85Mh37i8x9cn03Cgq2GBcjz2R0/c/jPufgnqIXBRsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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