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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e5f0c5285679f23ac368072f877cb48b8c65b2ad21141b2067b73afc945de86c' 
  AND token = '8eiMN+rFBG84D4ocAU0P+q7TcABM2ME5heB+UDtWheg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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