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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fcf0b3bd76537150a65628c38f509ebd9a88a28e23d8a6a96183f28cd053e258' 
  AND token = 'zPgwCnjWSRDJjbFSmmfree063ppt8A32ipx9AQ4BmQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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