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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '273d53020eb65ada9203a917f2c8c7911365e5706aacfc597df6c30ff6d8a74d' 
  AND token = 'dNMlMD9XKdfhE7cvXUjdbeKmnmbMaSgUkZUPcz7VwMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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