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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ab096978c36bb499b7d07dbfbd62a0f95b62ade133c52862eb9e23ff9bebe993' 
  AND token = '1Cx8hP7HR96+YUpssgXtaLpp4rlrnkDsPpopsctI9NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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