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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b3f906e1e3ccd91d24b3a558da8632debc58b8405f69174dbbcca9b31d7ad14b' 
  AND token = 'mVDr/BnLQrYr9NMiSvuz/imsQf9bqXxSISQCee/lvvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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