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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '128bc6b0d33244b6463d186adbbd40f6d014e3c68fb50a21ca7828887a4db13e' 
  AND token = 'Gn5TN3mZtHXEThbkdKcZyQUATQpkZbEm6BTtJ73MNI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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