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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '45bfc1e3adc21cfb4722e3dad65a75fc4ca7cbaf2a9b4be8fa53f835063b5e0d' 
  AND token = 'Hto+nB1zoC9+GHnDHgeXvkWwNDVO732nMbdz0o5OGmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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