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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2a256301ecccb85564fa625b7d4317cdca83e77080d78e097bc83cf96e879558' 
  AND token = 'nHnvUBcbovlJw66CEwMHhrhn1AkN73UarFWwc2LmorA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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