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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '783752074db0624676ef69c5746b10ffd5fc7413c05ebb8ecb158a28d45649b0' 
  AND token = 'J2E63U8ARDET0knGswDNMvKjn2ogxNz7hyHS4sbDRkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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