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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bab4a01da548b2e9e9d2216231fdc2346303448f7c8ec0ee21bcde09cec18f11' 
  AND token = 'omRqG4E71G6VJFPZRmkJcgc70KDkpflH2UPs7pBUEuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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