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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '14e0e624b40e06f4648bd611fab15e80d8ea96f662238c328adc2d11b372cbf4' 
  AND token = 'XQwmIkxbF7lkufMA2mDEFgnbj5pXmkA/aC1pwJopA9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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