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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84bf6a11d6604bee277055444a9811ad9cc271d6e81c4843fe51ced9d1aba0a9' 
  AND token = 'lyc2lqUgCzy+kD3ENhJ+z2oC56OqHZ+Ozpb9tclT9J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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