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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '47e8f4840ecca3630d169a553ade4c4e4fc579f04107970999c742945341b86d' 
  AND token = 'Jt3GftVDQKgTFCaT5ExW8u7jPWpg7dQFCyghgMX0K9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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