SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cd8f5d5cabf3ac19342f610ba6d8ca499657f59bd03caf9ceef9725b901f507a' 
  AND token = 'qATpuMBYK0HLTu/TPHZleFHAY1FAINjMRpZ9gmAUB40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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