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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3fa9d592ddd7f215612c6dc737c53b6416a538934def066310770201d8ecda6d' 
  AND token = 'f65X5RultSZpdAwpB4/gq81a5mfANcllMn7Kjxy4RtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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