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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '94ed5e74ac6575aeb199d9c3a36d71a38d3901f5faf278871a5b4220eff3f33a' 
  AND token = 'vHws332oUt7Q6zpaeFunHfw0Kp7FZKTeq1CV7PmGuQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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