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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '83caae99d735bf78e4f86fc85ed25f0bf358d2c913a4f1f4dce0ae95faafe6f4' 
  AND token = 'mevKKLEmz6JainhHxFcedpNi/6NNKQV23aK954LHhyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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