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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ebcf6d877c94202bc6320a3d86e093f7c0d23877b1f3cdd45e093cef49fa138a' 
  AND token = 'hG7pfxpll82865IvKHZ2GcdnenUhSrUh5+vih1J1SYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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