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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9a264351b617a877f6bb2d4a32c55b3bd25647ee638dd009259562c580c6f4a' 
  AND token = 'Zx/lGWo6nuNTc/jhKLHG68J3K2KJoUeN/nObl0rx5KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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