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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e4c9a7b4ab6e90ffa2ac377f66bd5c45e8f282c8c5f22b3923e59d9b55c5b009' 
  AND token = 'mc/BAYpEgRXKn2YyIh5KMG2ByrDsx5s7OeF1iaXBAzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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