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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '980a67a56441c07f19e20260abde711d98fd499ceb6bf24de429c8661621fd93' 
  AND token = 'vIsR8FaoHaxnuegsUuor/TsFXYrWQhNPFffO6vUDrrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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