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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '59b1da8c9974314078a8b2a24d0fe01aad9755332b543f3d3c077d1c425234ca' 
  AND token = '+i6AR37onaEEP1Jos1YwCJ4ofNYjjoItj/zruID+kEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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