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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eaf8140cd8e69c290e7fc2b44d0e1e07d4c90f01cf57011e1daaae1b03b2ba8b' 
  AND token = 'nCqpgkF6r7w6XrK0g4hV55XalxAKkqSOP2jHxK32rrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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