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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d58c2ea4f3858dd9b51c65b7b2e0df03962b89d4ffdaab59920b0844b9e9f2d' 
  AND token = 'cYpT2WS4JCH6F4dZ/YeTiDRQJPrZjJ0oTlzLR7AW11Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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