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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e9a761cb5a0816790f1e8909e4e4803bd6a48e31e07b554409e5a5ad1c8466d2' 
  AND token = 'X2az40/lSz5M8oomWwrs2xqbeioLfFG8VykBf6Kid9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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