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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0c04a233499b30f453707ffaf50884e06232523fc3e83fc7544ed8f0c2fec7e0' 
  AND token = '+kGNfkSnsJjfyLqzmDEqSyJEW8qcE8FD8MHVV+wdcm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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