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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd65e0d4177b3bc8c71e5b522689592640a39cae4b3334178a279e96b44ee93ed' 
  AND token = '/E1j9/jhT87FpNpftyJ/wPo/ZdwjWjqfu0WaC6EjI0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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