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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b77a43e8a6905c6d4e17651d875d6a4433fc0830513d51f21921cba2c6119efc' 
  AND token = 'zRTd0AZzSm4xwuaRk0twEFLMT7Rd/SojfZ8ZVI0bb5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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