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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9629fd9f54434d044bded6cc7c786247497566e4efcac03a3373e9dc9e673eb2' 
  AND token = 'oiaBZYDrUM3dsbqZtjjQ7EKSJKbsX9tau334UKrqyBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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