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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ee37952a1bd61f221d29c7a95a0cae046973b41431c16d05357bf13ecdc6e7e0' 
  AND token = 'E+r1JHLTNPL6E01TgGCx9OwwrrsQqMmMEoN//aiQrk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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