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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c91331620d24db573c0491051eb31279c32df2291f53c7731c6272222dbdf3c2' 
  AND token = 'LbOw3qbTy9H+y6dEkqEccZLPmsF+xZd40V7I/5Rneqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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