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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '58980609973b012fabaa6c959c89e52ca7e41654cd98847956e8ed224d13c8e8' 
  AND token = 'MHw8uHkbvh+xlBLWz/lO5F6TSWU9fC3xj4+iT04rhd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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