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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3258212162473ff7062a338a8e9622fae2b084506d7f205fde6720f533d31e2d' 
  AND token = 's614PIyJnrOgYjgtxRJYFGhjJicPAWPn2fTbY02BvKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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