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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4797f777259a0e504f9f7f5c5e3c5d4000cc5ff4d3597a66abff1ca1ab0662c0' 
  AND token = '+nhQlLtSQ1sC6fl9oGsVXtJG5C/hSUPileGM9gDBWXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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