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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '56b19abe1a1a59c4f0aa9af4aff302ce2b84481c2609dcb71c40a15a21622e75' 
  AND token = 'ug4DjYNv8U80xobGRXytvr9eL9sQZaI1/MHYApVdLGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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