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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e5fa5f45bc304bcd0c50368fdc7f06123a2d9aaa5633ce2aff33d75ac863dd90' 
  AND token = '7SnrLZWHwKJpeg8v0LhSkyodEM6ior/QWfvS1+RKbSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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