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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5ba9c9c07a624b08fa2ba897157ec10efa85a9133f607d970d02bd87dde4f126' 
  AND token = '7eJgS2s9Hzfz2nEPfluHDdsPl6Vc2w1jlAnqHaYf8Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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