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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8dbfd624f2647c4886e7e90a734179b0d716d7b8e29966ebc355fb229141ec44' 
  AND token = 'GYEhD7gYA11zUDGbn6caIYgZ8b1Q/2pk3//jwl2X1Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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