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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '239880a9f800b308909edaf4eef48a4c2ef50c927e32ade3b9f2719052714770' 
  AND token = 'Z5W6zf4p6nyJa7R5BAXo7xzKh/NrN56aRLJ9GMzdZEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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