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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a163deff5663f8f252d6248a19a937a346a7d1fe1c6e85f368ca9d8d34f5e459' 
  AND token = 'w6yWHscwwcitxOeAK7M3pK0/6FiE3D4XR8rzPZcEXfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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