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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '669c6fb5db44a63b610facc47b1ee5e72fce9583d6ab4b5f45d1aed062f06f44' 
  AND token = 'gzF9PiEmmqHBeTOYFjGuPxM1oapu98ZfaU6DY0fmVMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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