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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7416e2f7d3669684fa96ed7e0d52fa90031006d7e8ea40de3de30f7c463ab770' 
  AND token = 'mS0wkAQ9vqCBcK5wSc972EIhbt1LYAnz2GN59oPr/rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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