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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b3d95bf140224cd9529a37af0a446da703f3a40de5d7bc422a1a6db5ea629777' 
  AND token = 'bfd/kmrjx8+5T84M95N08ORu1rYAatZpwk48j8gFqK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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