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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5e0df6bd93ff11d11c51932a162c3a91381f9ffb6873b289e362d3d84160f220' 
  AND token = 'FjMKrO52Ldq3D5JL3OEjFR6XQ4ALpZmiBEmHM0d6w/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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