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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc58b67b9ef1e45b0e08ac5fb6fe1a61bd4704534b1708e4833520a445a0aab7' 
  AND token = 'xYSeNsemjNVN45jDBAKxoXA81xs5sLSLvT8GeP430Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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