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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd057a8e4f2e9faa3dbc96fdb3e369b289feeeb1b23a42d3f4b804bd92864119d' 
  AND token = 'zARconvBczv761WgLGztRJe3f7o4sBTHETzFI+nElj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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