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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '691aac6c82c7db5cf55246cb24ad0dec2b6ac70a79593e98cf3b3504e36f051a' 
  AND token = 'DkOiK1MDcVZHEJA8bsJRIgz9T7bjfRsH0LskuGbMhr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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