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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '95e411ddf28439df4dd9d26f09dfc5917cf2b2143defc965f4b3eddbb0b59f5d' 
  AND token = 'Cl1LFSzuTRSZKDso7pfoF+IC9nSBedXtWp9hRbvqWYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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