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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '555517235cd967555eced32b74a06ac30ffd83ab07f67cfc48eb81ecde2a48e3' 
  AND token = '7NCTGKxD8/saRZGxq1rDxr0lnOLPXcvwGAy2iSlM+Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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