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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f098fba179a65a45950c2d4c5f9b2bd874eb551c8034a395be5d5be6dcde2aa7' 
  AND token = 'JSQZqvQPqa2bd+0ywjKROFrr5vZC2p23+jqeUXM2ZRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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