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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70b37cf6c5f6ebee512cb564bf590ca72cd25f656269c552a5ee7b4c9046de12' 
  AND token = '9vgSIrbV62xq0MmODV7VG1+i6OZQYxsvkPK3wncYTI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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